JPH033212A - Iron core - Google Patents

Abstract

PURPOSE:To eliminate the loss of a steel plate and improve magnetic characteristics by forming one leg of a U-shaped core part wider than the other leg and by forming a cut-out which is equivalent to the difference between the length of an I-shaped core part and the width of a narrow leg of the U-shaped core part at the outside of the bottom of this wide leg. CONSTITUTION:A U-shaped core part 100 and an I-shaped core part 102 are provided. Then, one leg of the U-shaped core part 100 is formed widely (Width =W1) for a wide leg 100a, while the other leg is formed narrowly (width =W2) for a narrow leg 100b. Also, a cut-out part 104 is formed at the bottom of the wide leg, where the width and length of the I-shaped core part 102 are W3 and W1, respectively, and the width W3 of the I-shaped core part 102 is the same as the width (W3) at the bottom of the U-shaped core part 102. The I-shaped core part 102 is embedded into an opening 106 of the U-shaped core part 100 and the core is formed in square-shape, thus producing no loss and enabling each leg of the core to agree with the direction of roll of steel plate for improved magnetic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an iron core, particularly to an improvement in the structure of an iron core used in a ballast or a transformer.

[Prior Art] For example, a ballast for a discharge lamp, a transformer, etc. are constructed by winding a coil around an iron core, and the one shown in FIG. 10 is well known as such an iron core structure.

In other words, (A) in the same figure is a so-called EI type iron core, and 8
It includes a character-shaped core portion 10 and a single-character shape core portion 12 .

In addition, the same figure (B) shows the EE type core, and the figure 8-shaped core part 1
0a and 10b are arranged with their openings facing each other.

The figure (C) shows an ET type core, in which the protruding end of the T-shaped core part 14 is arranged to face the opening of the 8-shaped core part 10.

For example, as shown in FIG. 11, the EE type core is
A primary coil 16 is wound around the central leg of the shaped iron core 10a. Further, a secondary coil 18 is wound around the central leg of the E-shaped core portion 10b, and leak cores 20a and 20b are arranged between both coils 16 and 18.

Therefore, the secondary coils 1 and 6 and the secondary coil 18 are electromagnetically coupled via the iron core, and by passing current through the secondary coil, a desired voltage is applied to the secondary coil according to the turns ratio of both coils. It is possible to obtain an induced current of

On the other hand, FIG. 12 shows an EI type iron core, in which a primary coil 16, a secondary coil 18, and a leak core 20 are formed in the same manner as in FIG. 11.

FIG. 13 shows a CC type core, with a 0-shaped core portion 22a.
, 22b are arranged facing each other, and the same primary coils 16a, 16b and the secondary coil 18 are provided on the left and right legs, respectively.
a, 18 b are formed, and a leak 2 is formed in the center.
0 is placed.

Furthermore, in FIG. 14, two CC type iron cores shown in FIG.
A secondary coil 18 is formed in the leg of the iron core on the left side in the figure, and a choke coil 24 for increasing inductance is formed in the leg of the iron core on the left side in the figure.

As described above, various types of iron cores have conventionally been used depending on the purpose of use.

[Problems to be Solved by the Invention] Incidentally, the iron core is formed by punching a steel plate into, for example, a C-shape and stacking a plurality of them.

However, there was a problem in that a large amount of loss occurred during the punching process.

That is, when forming an E-shaped core part as shown in FIG. 15(A), the E-shaped core part 10 is punched out of a single roll-shaped steel plate so that both legs thereof are interlocked with each other. Therefore, the end portion 26 of the central leg of the E-shaped core becomes a loss.

On the other hand, when punching out the character 0-shaped core part 22, the legs of the core part adjacent to the opening part are positioned so as to be interposed, so that the tip end part 26 of each leg is lost.

In addition, the direction of the legs of each core portion is perpendicular to the rolling direction (arrow) of the steel sheet, resulting in a problem of deterioration of magnetic properties.

Furthermore, since the legs extend perpendicularly to the rolling direction of the steel plate, there is a limit to the length of the extraction force, and there is also the problem that the iron core structure has to be complicated and enlarged.

The present invention was made in view of the problems of the prior art described above, and its purpose is to provide a small and lightweight iron core that has good magnetic properties and can minimize loss that occurs during manufacturing. .

[Means for Solving the Problem] In order to achieve the above object, an iron core according to the present invention includes a U-shaped core portion and a single-shaped core portion, and the opening of the U-shaped core portion has the above-mentioned shape. It is constructed by arranging a single-shaped iron core.

The width of one leg of the U-shaped core is wider than the other leg, and the longitudinal direction of the leg of the U-shaped core is set to be the roll direction of the steel plate on the outer side of the bottom of the wide leg.

Then, the wide legs of the U-shaped core are arranged in the openings of the adjacent U-shaped cores. Further, a notch corresponding to the difference between the length of the single-shaped iron core portion and the width of the narrow leg of the U-shaped iron core portion is formed on the outer side of the bottom of the wide leg, so that the single-shaped iron core portion is It can be located at the tip of the narrow leg of the U-shaped core.

As described above, since the two sets of iron cores are combined to form a rectangular shape, the arrangement of the steel plate on the roll can be set arbitrarily. Therefore, by making the direction of the legs of the U-shaped core coincide with the rolling direction of the steel plate, the magnetic properties of the core can also be improved.

Furthermore, since the longitudinal direction of the legs of the U-shaped core portion coincides with the roll direction, the length can be set to any desired length, and there is no need for the core to have a complicated structure as in the past.

[Function] Since the iron core according to the present invention has the above-mentioned means, [Embodiments] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an iron core according to a first embodiment of the present invention, and FIG. The condition is shown.

A characteristic feature of the present invention is that the width of one leg of the U-shaped iron core is wider than the other leg, and the length of the U-shaped iron core The difference between the width of the narrow leg and the width of the narrow leg is formed.

For this purpose, in this embodiment, a 0-shaped core portion 100 and a 1-shaped core portion 102 are provided.

As is clear from the same figure (A), the one leg of the 0-shaped iron core part 100 is formed wide (width=W8), and the wide leg 10
0a, and the other leg is formed narrow (width/W2) to constitute a narrow leg 100b. In addition, there is a notch 1 at the bottom of the wide leg.
04 is formed.

Here, the 1-shaped core part 102 is formed to have a width of W3 and a length of W, and the width W3 of the 1-shaped core part 102 is the same as the width (W, ) of the bottom of the 0-shaped core part 102. It has become.

The wide legs 100a of each U-shaped core are positioned at the openings of the opposing U-shaped cores. Further, each of the 1-shaped core portions 102 is a narrow leg 100b of the 0-shaped core portion 100.
It is located at the tip of the.

Therefore, on the rolled steel plate, the two U-shaped cores and the single-shaped core 211 forming the two sets of cores form a quadrilateral.

Each of the core parts punched out in the above manner constitutes an iron core as shown in FIG. 3B.

That is, the 1-shaped core part 102 is fitted into the opening 106 of the 0-shaped core part 100, and the core is formed in a square shape.

Therefore, no loss occurs, and each leg of the iron core coincides with the rolling direction of the steel plate, resulting in good magnetic properties.

FIG. 2 shows an iron core according to a second embodiment of the present invention,
Components corresponding to those in FIG. 1 are designated by the same reference numerals and their explanations will be omitted.

The characteristic feature of this embodiment is that the single-shaped iron core portion 102
The length (w+') of is set slightly smaller than the opening width (W, ) of the opening 106 of the 0-shaped core part 100, and the 1-shaped core part 1
02 into the opening 106, the 0-shaped iron core 100
Gap 108a, 108 between and single-shaped iron core part 102
This is so that b occurs.

FIG. 3 shows an iron core according to a third embodiment of the present invention,
Components corresponding to those in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

The characteristic feature of this embodiment is that, as in the first embodiment, grooves 110 are provided in the center of both sides of the 1-shaped core in the iron core without a gap, and the grooves 110 are used to form the 0-shaped core. 100 and welded it.

FIG. 4 shows a fourth embodiment of the present invention, and parts corresponding to those in FIG.

The characteristic feature of this embodiment is that the single-shaped iron core portion 1
02 is made to protrude, and the 1-shaped iron core part 102 is joined to the 0-shaped iron core part 100 via the protruding part 102a.

Therefore, the protrusion 102a of the single-character iron core 102 forms a narrow magnetic path, and the width of the protrusion 102a can be set to such an extent that the magnetic flux density is saturated.

FIG. 5 shows an iron core structure according to a fifth embodiment of the present invention, and parts corresponding to those in FIG.

The characteristic feature of this embodiment is that the single-shaped iron core portion 102
protrusions 102a and 102b are provided at both ends of the iron core 102, and the 1-shaped core 102 is joined to the 0-shaped core 100 via the protrusions.

Note that as a joining method, it is also possible to arrange the protrusions 102a and 102b outside the core as shown in FIG. It can also be placed on either side.

Next, a transformer etc. using the iron core according to each of the above embodiments will be specifically explained.

FIG. 6 shows an example of a circuit using the gapped core according to the second embodiment.

In the illustrated example, a coil 112 is wound around the wide leg 100a of the O-shaped core portion 100.

Therefore, it can be used as a choke coil, as shown in FIG. 4(B).

FIG. 7 shows an example of a circuit using the gapless iron core according to the first embodiment.

In the illustrated example, each leg 100a, 100b of the iron core is long, and a primary coil 114 and a secondary coil 116 are wound around the wide leg 100a, with a leak core 118 interposed between the two coils.

In this way, the leakage transformer shown in FIG. 3(B) is constructed.

Note that a compound winding type can also be configured in the same manner.

FIG. 8 shows an example of a circuit using the iron core according to the second embodiment.

The core according to the illustrated example has a primary coil 114 on the narrow leg 100b of the O-shaped core portion 100, and a primary coil 114 on the narrow leg 100a.
A secondary coil 116 is wound around each.

As a result, a phase advance type one-cage transformer as shown in FIG. 3(B) can be constructed.

Note that a compound winding type can also be configured in the same manner.

FIG. 9 shows an example of a circuit using the iron core according to the first embodiment.

In the illustrated example, a coil 112 is wound around the wide leg 100a of the O-shaped core portion 100, and a transformer as shown in FIG. 2B is constructed.

As described above, according to the iron core of the present invention, since the longitudinal direction of the legs is arranged in the roll direction of the steel plate, the extraction force can be set to any length, and the iron core can be formed into a complex shape unlike the conventional one. There's no need to.

Therefore, the core can be made smaller and lighter, and the assembly workability can be improved.

In addition, there is little loss of the steel plate, and since the roll direction of the steel plate and the direction of the legs match, it has excellent magnetic properties.

Furthermore, there is no need to use a rectangular core like the EE or EI type iron cores.

[Effect of the invention] As explained above, according to the iron core according to the present invention, U
The width of one leg of the character-shaped iron core is made wider than the other leg, and the difference between the length of the character-shaped iron core and the width of the narrow leg of the U-shaped iron core is provided on the outside of the bottom of the wide leg. Since the notch is formed, there is less loss of steel sheet, and the magnetic properties can also be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of the iron core according to the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of the iron core according to the second embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram of the configuration of the iron core according to the fourth embodiment of the present invention. FIG. 5 is an explanatory diagram of the configuration of the iron core according to the fifth embodiment of the present invention. An explanatory diagram of a choke coil using the iron core according to the second embodiment, FIG. 7 is an explanatory diagram of a one-cage transformer using the iron core according to the first embodiment, and FIG. 8 is an explanatory diagram of the iron core according to the first embodiment. FIG. 9 is an explanatory diagram of a transformer using the iron core according to the first embodiment. FIG. 10 is an explanatory diagram of various conventional iron core structures. The figure is a circuit configuration diagram using the conventional iron core, and FIG. 15 is an explanatory diagram of the problems of the conventional iron core. 100...U-shaped core part 102...1-shaped core part

Claims (1)

[Claims] (1) Comprising a U-shaped core portion and an I-shaped core portion,
In the iron core in which the I-shaped iron core is disposed in the opening of the U-shaped iron core, one leg of the U-shaped iron core is formed wider than the other leg, and the wide leg has the outer part of the bottom of the wide leg. An iron core characterized in that a notch is formed for the difference between the length of the I-shaped core and the width of the narrow legs of the U-shaped core.